Stochastic geometry analysis of a distance-based JT scheme in C-RAN

TL;DR

This paper analyzes a distance-based joint transmission scheme in C-RANs using stochastic geometry, deriving coverage and spectral efficiency distributions considering power, density, and overlap effects, validated by simulations.

Contribution

It introduces a stochastic geometry model for a joint transmission scheme in C-RANs that accounts for resource sharing and set overlaps, providing new analytical expressions.

Findings

Coverage and spectral efficiency distributions are derived.

Model accounts for power allocation, user and RRH densities, and overlaps.

Analytical results match Monte Carlo simulations.

Abstract

This paper considers a joint transmission scheme (JT) developed for cloud radio access networks (C-RANs). This proposed scheme features cooperative sets of remote radio heads (RRH) defined in a disk around each user location. The nodes belonging to each of these sets perform a weighted maximum ratio transmission to jointly serve the user. The powers allocated to the beamformers are computed at the network baseband unit, taking into account channel gains, as well an equity criterion between the users. In comparison with the existing literature, our model includes a saturation assumption, with all transmissions taking place over the same resource block. A RRH belonging to multiple sets can hence transmit to several users simultaneously. The distributions of the network coverage and spectral efficiency are calculated by means of stochastic geometry (SG), and compared with Monte Carlo simulations. The derived expressions take into account the power allocation, the user and RRH densities, as well as the statistical correlation resulting from the set overlaps.